Trifluoromethyl-Radical-Mediated Carbonylation of Alkanes Leading to Ethynyl Ketones
作者:Yoshitaka Uenoyama、Takahide Fukuyama、Keisuke Morimoto、Osamu Nobuta、Hidefumi Nagai、Ilhyong Ryu
DOI:10.1002/hlca.200690228
日期:2006.10
The carbonylation of alkanes 1 under radical-reaction conditions was examined by using ethynyl triflone A as the unimolecular chain-transfer (UMCT) reagent. Good to moderate yields of ethynyl ketones 2 were prepared by means of this three-component coupling reaction. Higher CO pressures as well as lower concentrations of triflone A improved the efficiency of the reaction over the direct addition, the
使用乙炔基三氟甲酮A作为单分子链转移(UMCT)试剂,检查了自由基反应条件下烷烃1的羰基化作用。通过这种三组分偶联反应,制备了乙炔基酮2的良好至中等的产率。与直接添加相比,较高的CO压力和较低的三氟甲酮A浓度提高了反应效率,后者导致烷基化乙炔3。与与A的反应相反,环己烷(1a)与烯丙基三酮B的反应。(= 2-亚甲基-3-[[(三氟甲基)磺酰基]丙酸乙酯)在CO存在下得到羰基化产物的混合物,包括由环己烷,CO和烯丙基三氟乙烯乙的两个分子各自形成的8a。